Patrick Frater Asia Bureau ChiefZhang Yimou’s period espionage thriller “Cliff Walkers” ran out a comfortable winner at the mainland Chinese box office, ahead of other holdovers and new release titles including Jason Statham-starring “Wrath of Man.”“Cliff Walkers” dropped only 32% between its second and third weekends, taking $16.6 million between Friday and Sunday, according to data from consultancy Artisan Gateway.